Double-acting ball thrust-bearing.



K. J. VON KAJDACSY.

' DOUBLE ACTING BALL THRUST BEARING.

APPLICATION FILED DEC. 10. 912.

1 1 52,995, Patenfied Sept. 7, 1915.

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.UNITED STATES PATENT OFFICE.

KAR :rnLI Us VON KAJnAcsia'oF KIEL, GERMANY, ASSIGNOR, BY MESNE ASSIGNMENTS, 'TO DEUTSCHE wArrENnNn MUNITIONSFABBIKEN, or BERLIN, GERMANY.

DOUBLE-ACTI G BALL THRUST-BEARING.

' To all whom it may concern Be it known thatL'KanL JULIUs voN KAJDACSY, a citizen of the German Empire, residing at Kiel, Germany, have invented certain new and useful Improvements in Double-Acting Ballv Thrust-Bearings, of

i which the following is a specification.

Double-acting thrust ball-bearings with one ball system for each direction of pres-.

sure, and with horizontalor inclined shaft,

possess the disadvantage that axial play 00- cursinthat one of'the two ball systems which is temporarily without load andinactive. Consequently, the balls and the ballraces .of this inactive ball system are readily displaced by the effect of their'own weight or by centrifugal force. 'During .the subsequent change in the direction of pressure such bearings have therefore a tendency to bind whichresults in the bearings running hot and in a'rapid wearing out of the parts.

This objectionable play is incident also to pressure bearings which are originally constructed without play, owing tothe unavoidable wearing of their cooperating-parts.

The present invention has for its purpose to provide a ball thrust bearing of the type referred to, in which the axial'compactness of the two ball systems'will be always maintained when unloaded as well. aswhen loaded, so that lagging of the parts is precluded.

. In the drawing forming part of this specification, in which anembodinient of the in vention is shown by way of illustration, Fig ure 1 is an axial section of a ball thrust bearing arranged accordingto the invention, while Fig. 2- discloses a similar view of the lower half of a somewhat modified embodiment. Fig. 3 is a plan view of spring S;

'Fig. 4:, an edge view of part of the spring developed and Fig. 5, a cross section at 5+5 of Fig. 4.

Referring first to the embodiment dis closed in Fig. 1,'A isashaft, for example the propeller shaft of a ship, which transfers the thrust of the propeller to the ball thrust bearing fixedly arrangedin the vessel. Between the two halves of the housing D of the thrust bearing, pressure ring E issuspended. against whichlie the inner raceways F and G of the ball systems B and C. The

corresponding outer ball raceways F and G support themselves against annular intermediate pieces Hand K vxhichare dis placeable to a slight degree, in an axial di- Specification of Letters Patent. Patented Sept. '7, 1915. Application filed December 10, 1912.- Srial No. 736.025. I

rection, upon the rings L, The rings L, M are securedagainst displacement in the direction of the axis of: the shaft through means of a turned shoulder a on the shaft and a band J mounted on the shaft, and sus tained one against the other, by means of a box N. The box N is surrounded by cylindrical sleeves O, P, of two different diameters, which are provided on their inner ends with opposed flanges and receive between said flanges, a strong helical spring R, for which each flange serves as an abutment. The outer end of the sleeve P engages through a flange 20 in a recess of the intermediate piece K, while the outer end 0 of the sleeve The transfer of this thrust upon the housing or upon its foundation takes place in. that case through the Inedium of the ball system B and, consequently, through the band J, ring L, intermediate piece raceway F ball-row B, raceway ,F' an if thrust ring E. In this direction of thrust, the ball system C is relieved. Release of the balls and raceways i's, however, prevented, since the sleeve P under theinfluence of the helical spring R presses the parts of this ball. system against the-thrust ring E, incident to which there is some existing play between the parts K and M, as will be seen from the drawing. If the direction of thrust, upon .the shaft changes, the force of this thrust will be transmitted to the housing 1),

-.through the medium of the ball system C,

that is to say through the parts ai M, K, G C, G and E, whereupon the same helical spring R which previously pressed the system C against the thrust ring E, now, in the same manner. effects the holding together of the parts of the'ball system B. It is thus evident that the position of the parts of both ball systems relatively to the shaft A, regardless of. the direction in which the thrust acts, remains permanently unchanged.

The embodiment of the subjectmatter of the invention shown in Fig. 2 differs from that of Fig. l, essentially, only in that the unloaded ball system will be pressed not against the pressure ring E, but against the rings L", M upon the shaft. For this purpose, there'is employed a system of plate springs S of wavy form, which are located in an annular recess formed by two rings T T.' One of these springs S is illustrated in Figs. 3, +l and The two rings T T are arranged to be displaceable against the thrust body E to acertain degree, and transfer to the thrust body E the force exerted. upon them from the one or the other ball system (according to Fig.2, the hall system B).

The described embodiments. in which thereis employed for both ball systems, a single spring interposed between them, distinguish themselves by their especial simplicity. Except for this consideration, aaid without departing from the essence of the invention, there can be employed for each ball system, a special spring system and this can be supported against the housing or the parts of the shaft.

I claim I 1. In a thrust ball bearing constructed for application to a shaft provided with a pair of thrust collars', spaced apart thereon; said tirust ball bearing comprising an intermediatelylocated abutment member, hall race (for the time being;

member: with balls between them, said ball .race members being constructed to engage with said abutment member and said thrust collars respectively, and being thereby adapted to transmit thrust directly from the shaft to said alnitn'ient member, a spring tending to press said ball race members againstthe balls, thereby sustaining the balls in position when. no thrust is being transmitted from the shaftto the housing.

In. a thrust ball b aring constructed for application to a shaft provided. with a pair of thrust collars. spaced apart thereon; said thrust ball bea ing comprising an intermediatclv located abutment ineu'ilier, two pairs of ball race members with balls between them, the membersv of each pair being con- 'structcd to engage with one of said thrust collars and said abutment member and being thereby ada ptcd to transmit thrust from the shaft to the abutment member, a sin'in'g" tending; to press the ball race members against corres 'ionding balls, thereby sustaining the inactive balls in position while the thrust is being transmitted to active balls frcm the shaft 1o said abutment member.

3. In a double acting thrust ball. bearing for a shaft. a stationary bearing the thrust collar adapted to transmit I opposi e directions to the stationary J, hiring and a pair of abutments constructed to receive thrust in opposite-dircctions from the shaft. two pairs of ball race members with built. between. them, each pair rigidly engaging with the thrust .llar on. the one hand,

the thrust-is being transmitted by the active' balls from the shaft to the stationary bearing.

s In a double acting" thrust ball bearing for a shaft, a suitable stationary bearing therefor, a thrust collar mounted on said stationary bearing, a pair of ball systems suitably constructed to be suspended between abutments on the shaft, adapted to resist the thrustofthe shaft in opposite directions, each of said systems comprising a pair of ball race rings with balls between them, an inner ring iii-each pair butting against said thrust collar, a spring tending to press the rings against the balls thereby sustaining the inactive balls in position While the'thrust is being transmitted by-the active balls from the shaft to said thrust collar.

5. In a double acting thrust ball bearing for a shaft, provided with a pair of thrust abutments, a thrust collar constructed to be mounted on a suitable stationary bearing, a. pair of ball systems suitably constructed to be suspended between the abutments on the shaft adapted to resist thrust of the shaft in opposite directions, each-of said systems comprising a set of balls, an inner ball race ring engaging with said thrust collar and an outer ball race ring engaging with said shaft a butments, two telescoping, sleeves having opposing collars engaging respectively with the outer ball race ring of the ball systein, a. spring between .xaid sleeve collars adapted to telescope the sleeves and thereby 6 to force together the two ball. systems.

6. In a thrust- -ball bearing for shafts and a suitable housing therefor, ball race members with balls between them, said members being constructed to receive a shaft abutment and a housing abutment, respectively, and being thereby adapted to transmit thrust directly from the shaft to the housi: and a spring adapted to press said members against said balls thereby sustaining the balls in position while no thrust being transn'utted from the shait to the housing. 1

7. In a thrust hall liicaring for shafts and.

a suitable housing therefor, two pairs of ball "9 tion whiletbe thrust is being transmitted hand, and a spring adapted to press the ball race members of each pair against the corresponding balls thereby sustaining the temporarily inactive balls in position while the,

thrust isbeing transmitted by the active balls from the shaft to the housing.

9. In a double-acting thrust ball bearing for shafts and a suitable housing therefor, a thrust collar constructed to be mounted in the housing, a pair of ball systems suitably constructed to be suspended between abutments on the shaft to adapt them to resist the thrust of the shaft in opposite directions,

1 each of said systems comprising a pair of ball race rings with balls between them, the

inner ring in each pair abutting against said thrust collar; a spring adapted to press the rings against the balls thereby sustaining the inactive balls in position while the thrust is being transmitted by the active balls from the shaft to said thrust collar.

10. In a double-acting thrust ball bearing 4 for shafts and a suitable housing therefor, a thrust collar constructed to be mounted in the housing, a pair of ball systems suitably constructed to be suspended between abutments on the shaft to adapt them to resist 1 thrust of the shaft in opposite directions,

each of said systems comprising a set of balls, an inner ball-race ring engaging with said thrust collar and an outer ball race ring engaging with the respective shaft abutments; two telescoping sleeves having opposing collars engaging respectively with the outer ball race ring of the ballsystems, a springbetween said sleeve collars adapted to telescope the sleeves and thereby to force together the two ball systems.

In testimony whereof I have affixed my I signature in presence of two witnesses.

KARL JULIUS VON KAJDACSY. lVitnesses:

JULIUS RoJRKE, KARL Fmnun. FREUPEL,

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

